docs: tracing: Add stacktrace filter command

Add a description of stacktrace filter command.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 7ea16a0ceffc50070e02d602a1e073cd634bd7d4..f82434f2795e2105e5e4cf9e1f68d70a403e2844 100644 (file)
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -2987,6 +2987,9 @@ The following commands are supported:
   command, it only prints out the contents of the ring buffer for the
   CPU that executed the function that triggered the dump.
 
   command, it only prints out the contents of the ring buffer for the
   CPU that executed the function that triggered the dump.
 

+- stacktrace:
+  When the function is hit, a stack trace is recorded.
+

 trace_pipe
 ----------
 
 trace_pipe
 ----------